| 级 |
jí shù | (math.) series |
| 级 |
jí | level / grade / rank / step (of stairs) / CL:个 / classifier: step, level |
| 数 |
shǔ | to count / to count as; to regard as / to enumerate; to list |
| 数 |
shù | number; figure / several; a few |
| 数 |
shuò | (literary) frequently; repeatedly |